St Flannan’s Primary

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St Flannan’s find plenty of fish

St Flannan’s pupils found plenty of fish in the Luggie Water, including a good-sized salmon parr and a beautiful three-spined stickleback. The stickleback (Willie’s favourite fish!) had a bright red belly, signalling the first steps in its courtship behaviour.

Have a look at some of the pictures below….

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St Flannan’s: hoping to see the fish again

Lauren says: hiyaah x I really enjoyed letting the fish go but felt sad to see them leave 🙁
I hope to see Kylie and Willy again (and the fish) 😀

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Clyde River Foundation: pictures from St Flannan’s release day

St Flannan’s Primary released their fish into the Luggie Water. After several days of quite persistent rain, the flow level was high, so instead of releasing the fish directly into the river, pupils poured their fish into Kylie’s bucket so she could do the honours on behalf of the class.

Have a look at some of the pictures we took during the release day.

After the release, we all returned to class. Kylie also fielded a question and answer session. Here are a few of the top notch questions from the budding scientists of St Flannan’s.

Andrew’s question: will they be able to hide?

Answer: Yes. Trout fry will hide from each other and from predators in amongst the stones in the river bed.

Lauren: Will they move away from the Luggie?

Answer: Yes. They could potentially move away from the Luggie when they are older. Larger fish would move to deeper waters in the Kelvin river (which the Luggie flows into).

Daniel: how old will the fish live?

Answer: in rivers trout will live on average to 3-5 years old, but if they became sea trout they could live to be 13 or 14 years and weigh around 15kg.

Jade’s question: Would the temperature of the river change with the seasons?

Answer: Yes. Not only does it change with the seasons, it changes on a daily basis (to use the correct scientific term… ‘diurnally’ – diurnal means over a 24 hour period ). So for example the water is warmed by the sun and heats up during the day.

Molly’s question: How many eggs will they lay?

Answer: it depends how much they weigh. A 4kg fish would lay around 8,000 eggs. Brown Trout lay approximately 2,000 eggs per kilogram of their body weight.

Rebecca’s question: How do you get bubbles in the river?

Answer: Air is trapped as the water passes over rocks on the riverbed. This allows oxygen to dissolve into the water so fish can breathe. Bubbles are seen as areas of white water on the surface (called ‘riffles’).

Lauren’s question: If a trout gets really big would it ever get eaten?

Answer: Yes. Although bigger fish are skilled at hiding from predators, larger predators such as otters, mink and humans would be able to catch and eat adult brown trout.

Amy’s question: will all the fish be the same size if they started.

Answer: Bigger eggs make bigger fish and bigger fish have a higher chance of survival. Their size also depends on their ability to hunt and scavenge for food and evade predators.

Christopher’s question: Could a group of small brown trout hunt and kill a bigger fish?

Answer: Great question! But no. Brown trout do not behave in this way. Pirahanas on the other hand…!

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